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Reversible S 0 /MgS x Redox Chemistry in a MgTFSI 2 /MgCl 2 /DME Electrolyte for Rechargeable Mg/S Batteries
Author(s) -
Gao Tao,
Hou Singyuk,
Wang Fei,
Ma Zhaohui,
Li Xiaogang,
Xu Kang,
Wang Chunsheng
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201708241
Subject(s) - dimethoxyethane , electrolyte , redox , polysulfide , chemistry , anode , overpotential , battery (electricity) , dissolution , inorganic chemistry , cathode , chemical engineering , electrochemistry , electrode , power (physics) , physics , quantum mechanics , engineering
The redox chemistry of magnesium and its application in rechargeable Mg batteries has received increasing attention owing to the unique benefits of Mg metal electrodes, namely high reversibility without dendrite formation, low reduction potentials, and high specific capacities. The Mg/S couple is of particular interest owing to its high energy density and low cost. Previous reports have confirmed the feasibility of a rechargeable Mg/S battery; however, only limited cycling stability was achieved, and the complicated procedure for the preparation of the electrolytes has significantly compromised the benefits of Mg/S chemistry and hindered the development of Mg/S batteries. Herein, we report the development of the first rechargeable Mg/S battery with a MgTFSI 2 /MgCl 2 /DME electrolyte (DME=1,2‐dimethoxyethane, TFSI=bis(trifluoromethanesulfonyl)imide) and realize the best cycling stability among all reported Mg/S batteries by suppressing polysulfide dissolution. Mechanistic studies show that the battery works via S 0 /MgS x redox processes and that the large voltage hysteresis is mainly due to the Mg anode overpotential.